import os
from flask import Flask 

def create_app(testConfig = None):
    app = Flask(__name__, instance_relative_config = True)
    app.config.from_mapping(
        SECRET_KEY = 'dev',
        DATABASE = os.path.join(app.instance_path, 'gitapp.sqlite')
    )

    if testConfig is None:
        app.config.from_pyfile('config.py', silent=True)
    else:
        app.config.from_mapping(testConfig)
    

    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass
    
    @app.route('/hello')
    def Hello():
        return "Hello,HHG's Simple Server"

    # register .
    from . import gitapp
    app.register_blueprint(gitapp.bp)
    
    return app
